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Roger L. Reep - One of the best experts on this subject based on the ideXlab platform.
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thromboelastography in wild florida manatees Trichechus manatus latirostris
Veterinary Clinical Pathology, 2018Co-Authors: Ashley Barratclough, Ruth Francis Floyd, Ray L. Ball, Roger L. Reep, Bobbi J. ConnerAbstract:BACKGROUND: Thromboelastography (TEG) provides a comprehensive evaluation of blood clot formation. This test can be used to identify abnormalities in coagulation by assessing multiple aspects of the clotting cascade, including the speed of clot initiation and formation, clot strength, and ultimately fibrinolysis. Thromboembolic disease has been hypothesized to play a role in the pathophysiology of cold stress syndrome (CSS), an important cause of mortality in the threatened Florida manatee (Trichechus manatus latirostris). OBJECTIVES: The objective of this study was to establish thromboelastography RIs using the TEG 5000 with citrated whole blood samples and kaolin activation in wild, healthy manatees. METHODS: In December 2014 and January 2015, 29 wild manatees (17 male and 12 female) were blood sampled as part of the annual wild manatee health assessments organized by United States Geological Survey (USGS). TEG was performed using citrated kaolin-activated samples. RESULTS: The samples were obtained from manatees caught in Crystal River, Citrus County, and used to identify the mean ± SD of normal TEG parameters: R = reaction time 2.1 minutes (0.8), K = clot formation time 0.8 min (0), α angle = 83.1° (2), MA = maximum amplitude 75 mm (7.6), and LY30 = clot lysis 0.41% (0.68). No significant differences were found between manatee size, sex, or time between sampling and running the test. CONCLUSIONS: Manatee TEG parameters demonstrate a relatively hypercoagulable condition when compared to other mammals. This information will facilitate detection of changes in hemostasis during injury and disease and provide a valuable reference range.
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golgi analysis of neuron morphology in the presumptive somatosensory cortex and visual cortex of the florida manatee Trichechus manatus latirostris
Brain Behavior and Evolution, 2016Co-Authors: Laura D Reyes, Roger L. Reep, Tessa Harland, Chet C Sherwood, Bob JacobsAbstract:The current study investigates neuron morphology in presumptive primary somatosensory (S1) and primary visual (V1) cortices of the Florida manatee (Trichechus manatus latirostris) a
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tactile discrimination of textures by florida manatees Trichechus manatus latirostris
Marine Mammal Science, 2012Co-Authors: Gordon B. Bauer, Joseph C Gaspard, Debborah E Colbert, Jennifer B Leach, Sarah A Stamper, David A Mann, Roger L. ReepAbstract:Two male Florida manatees (Trichechus manatus latirostris) demonstrated sensitive tactile discrimination in a two-alternative forced choice task, using a modified staircase method. Stimuli were acrylic plates with vertical gratings of ridges and grooves. The standard stimulus, present on every trial, had 2 mm gratings and the comparison stimuli had wider gratings. The blindfolded subjects were trained to demonstrate discrimination by pressing the target with wider gratings. Discrimination thresholds (75% correct) for the subjects were 2.05 mm and 2.15 mm, corresponding to Weber fractions of 0.025 and 0.075, respectively. These results indicate thresholds on similar stimuli comparable to humans (index finger tasks) and better than harbor seals, Phoca vitulina, and the closely related Antillean manatee, Trichechus manatus manatus. Memory for the tactile task was quite stable for both subjects, over 2 yr in the case of one of the subjects. Video analysis of responses indicated that bristle-like hairs, perioral bristles, and skin on the oral disk were involved in the discrimination response.
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topographical organization of the facial motor nucleus in florida manatees Trichechus manatus latirostris
Brain Behavior and Evolution, 2007Co-Authors: Christopher D. Marshall, Susan D Vaughn, Diana K Sarko, Roger L. ReepAbstract:Florida manatees (Trichechus manatus latirostris) possess modified vibrissae that are used in conjunction with specialized perioral musculature to manipulate vegetation for ingestio
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Evoked potential measurements of the West Indian manatee modulation rate transfer function
The Journal of the Acoustical Society of America, 2004Co-Authors: David A Mann, Joseph C Gaspard, Debborah E Colbert, Brandon M Casper, Roger L. Reep, Mandy L. H. Cook, Gordon B. BauerAbstract:Evoked potential measurements of two Florida manatees (Trichechus manatus latirostris) suggest that these herbivores have evolved an auditory system with high temporal resolution. The manatee modulation rate transfer function (MRTF) is maximally sensitive to a 600‐Hz amplitude modulation (AM) rate. This modulation rate is midway between the AM sensitivities of terrestrial mammals (chinchillas, gerbils, and humans) (80–150 Hz) and dolphins (1000–1200 Hz). We also demonstrate evoked potential responses to carrier frequencies up to 40 kHz. These results suggest that manatees may have reasonable underwater localization abilities despite the high speed of sound underwater, which could be important in enabling them to localize oncoming boats.
Wildlife Service - One of the best experts on this subject based on the ideXlab platform.
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WEST INDIAN MANATEE ((Trichechus manatus manatus)
2013Co-Authors: Antillean Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their nearest relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee (U.S. Fish and Wildlife Service, 1986). The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). The Antillean manatee is found in eastern Mexico, Central America, northern and eastern South America, and in the Greater Antilles (Lefebvre et al., 1989). In Puerto Rico, the manatee is most abundant along the south and east coasts, particularly in the area of Fajardo and Ceiba (Roosevelt Roads Naval Station) and in the Jobos Bay area between Guayama and Salinas. In general, manatees are not abundant on the north coast although they are infrequently seen in areas immediately to the west of San Juan (Mignucci Giannoni, 1989, Caribbean Stranding Network, unpubl. data). Manatees are rarely seen near Culebra Island and are generally absent from Mona Island and the Virgin Islands (Caribbean Stranding Network, unpubl. data). The U.S. has jurisdictional responsibilities for the Antillean subspecies only in Puerto Rico and the U.S. Virgin Islands. POPULATION SIZE The exact number of Antillean manatees known to occur in Puerto Rico is unknown but, based on aerial surveys conducted on July 16 and 17, 1994, this population includes at least 86 individuals (Oland, pers. comm.). Manatees are virtually unknown from the U.S. Virgin Islands (Lefebvre et al., 1989). A rare sighting and stranding was reported here i
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September 2000 APPENDIX V: WEST INDIAN MANATEE (Trichechus manatus latirostris):
2012Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures, the manatee's winter range has expanded significantly (Beeler and O'Shea, 1988). On the east coast, manatees are now known to winter as far north as southeastern Georgia and, on the west coast, as far north as Crystal River, Florida. Documentation of manatee movements between Gulf and Atlantic coast populations in far south Florida is lacking, presumably because lack of suitable habitat in Florida Bay is not conducive to such movements, but significant genetic variation between coastal populations has not bee
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APPENDIX IV. West Indian manatees stock assessments- Florida and Antilles stocks. WEST INDIAN MANATEE (Trichechus manatus latirostris)
2012Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures
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APPENDIX V: West Indian manatees stock assessments- Florida and Antilles stocks WEST INDIAN MANATEE (Trichechus manatus latirostris):
2000Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures, the manatee's winter range has expanded significantly (Beeler and O'Shea, 1988). On the east coast, manatees are now known to winter as far north as southeaster
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APPENDIX V: WEST INDIAN MANATEE (Trichechus manatus latirostris):
1995Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures, the manatee's winter range has expanded significantly (Beeler and O'Shea, 1988). On the east coast, manatees are now known to winter as far north as southeaster
Florida Stock - One of the best experts on this subject based on the ideXlab platform.
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WEST INDIAN MANATEE (Trichechus manatus)
2015Co-Authors: Florida StockAbstract:The West Indian manatee (Trichechus manatus) is found in coastal and riverine areas of North America, Central America, and South America and in islands in the Caribbean basin. Two subspecies are recognized. In 1934, Hatt (1934) identified an Antillean and a Florida subspecies, Trichechus manatus manatus and Trichechus manatus latirostris, respectively, and Domning and Hayek (1986) subsequently reported that the two subspecies could be identified based on cranial characteristics. They suggested that this subspeciation could reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek 1986). Within the jurisdictional waters of the United States (US), Florida manatees are found throughout the southeastern US and Antillean manatees are found in Puerto Rico and perhaps the US Virgin Islands (Lefebvre et al. 2001). Genetic differences between the Antillean and Florida subspecies have been identifie
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WEST INDIAN MANATEE (Trichechus manatus)
2013Co-Authors: Florida StockAbstract:The West Indian manatee (Trichechus manatus), is found in coastal and riverine areas of North America, Central America, and South America and in islands in the Caribbean basin. Manatees found within the jurisdictional waters of the United States (US) include Florida and Antillean manatees, subspecies of the West Indian manatee (Trichechus manatus latirostris and Trichechus manatus manatus, respectively). Within these waters, Florida manatees are found throughout the southeastern US and Antillean manatees are found in Puerto Rico. Significant genetic differences between the manatees of Florida and Puerto Rico exist and, as a result, these populations are identified as two separate stocks (Vianna et al. 2006, Kellogg 2008, and Tucker et al. 2011). Vianna et al. (2006) identified a gene flow barrier between Florida and Puerto Rico using mitochondrial DNA (mtDNA) analyses. Florida manatees are generally restricted to the inland and coastal waters of peninsular Florida during the winter, when they shelter in and/or near warm-water springs, heated industrial effluents, and other warm water sites (Hartman 1979, Lefebvre et al. 2001, Stith et al. 2006). In warmer months, manatees leave these sites and can disperse great distances (Figure 1). Individuals have been sighted as far north as Massachusetts, as far west as Texas, and in all states in between (Rathbun et al. 1982, Rathbun et al. 1990, Schwartz 1995, Fertl et al. 2005). On rare occasions, known Florida manatees have been sighted in Cuba and the Bahamas (Alvarez-Alemán et al 2010, Melillo-Sweeting et al. 2011). Warm weather sightings are most common in Florida, coastal Georgia, and Alabama (Rathbun e
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September 2000 APPENDIX V: WEST INDIAN MANATEE (Trichechus manatus latirostris):
2012Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures, the manatee's winter range has expanded significantly (Beeler and O'Shea, 1988). On the east coast, manatees are now known to winter as far north as southeastern Georgia and, on the west coast, as far north as Crystal River, Florida. Documentation of manatee movements between Gulf and Atlantic coast populations in far south Florida is lacking, presumably because lack of suitable habitat in Florida Bay is not conducive to such movements, but significant genetic variation between coastal populations has not bee
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APPENDIX IV. West Indian manatees stock assessments- Florida and Antilles stocks. WEST INDIAN MANATEE (Trichechus manatus latirostris)
2012Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures
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APPENDIX V: West Indian manatees stock assessments- Florida and Antilles stocks WEST INDIAN MANATEE (Trichechus manatus latirostris):
2000Co-Authors: Florida Stock, U. S. Fish, Wildlife ServiceAbstract:Manatees are typically found in the temperate and equatorial waters of the southeastern U.S., the Caribbean basin, northern and northeastern South America, and equatorial West Africa. Their near relative, the dugong (Dugong dugon), is found in the Indo-Pacific region. At present, manatees of the genus Trichechus are represented by three allopatric species: T. senegalensis, the West African manatee, T. inunguis, the Amazonian manatee, and T. manatus, the West Indian manatee. The West Indian species is subdivided into two subspecies, the Antillean manatee (Trichechus manatus manatus) and the Florida manatee (Trichechus manatus latirostris) (U.S. Fish and Wildlife Service, 1989). Such subspeciation may reflect reproductive isolation brought on by the intemperate northern coast of the Gulf of Mexico and characteristically strong currents found in the Straits of Florida (Domning and Hayek, 1986). Historically, the winter range of the Florida manatee (Trichechus manatus latirostris) was thought to focus on south Florida, with some animals ranging north of Charlotte Harbor on Florida's west coast and north of Sebastian on Florida's east coast. Extralimital movements occurred and were typically seasonal, with animals travelling north during warmer periods and travelling south as temperatures declined. While most manatees wintered in south Florida, some were known to winter in natural spring areas to the north (Hartman, 1974). With the advent of artificial warm water refugia, the spread of exotic submerged aquatic vegetation, and increased protective measures, the manatee's winter range has expanded significantly (Beeler and O'Shea, 1988). On the east coast, manatees are now known to winter as far north as southeaster
Miriam Marmontel - One of the best experts on this subject based on the ideXlab platform.
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cranial and chromosomal geographic variation in manatees mammalia sirenia trichechidae with the description of the antillean manatee karyotype in brazil
Journal of Zoological Systematics and Evolutionary Research, 2017Co-Authors: Helen Maria Duarte Do Rego Barros, Fabia De Oliveira Luna, Ana Carolina Oliveira De Meirelles, Pedro Cordeiroestrela, Neide Santos, Miriam Marmontel, Diego AstuaAbstract:We employed landmark-based 3D geometric morphometrics to assess cranial size and shape diversification in Trichechus manatus and T. inunguis to compare it with patterns among all manatee taxa (T. manatus latirostris, T. m. manatus, T. inunguis and T. senegalensis), and to analyse geographic variation within American manatee populations, using a sample of 189 skulls. Chromosome G- and C-banding techniques were performed in T. m. manatus from Brazil. All taxa were statistically discriminated by skull shape. Trichechus m. manatus and T. m. latirostris have larger skulls than T. inunguis. A morphological discontinuity was noted within T. m. manatus, with the Brazilian population south of the Amazon discriminated from the T. m. manatus Caribbean and T. m. latirostris USA populations. Specimens from Suriname and Guyana had a skull shape more similar to the one from the Caribbean population. The Brazil Antillean manatee population exhibited morphological differences similar in magnitude to those found between the Amazonian and African species. Additionally, structural chromosome differences were detected between that population (chromosome pair 4 is metacentric and 10 is submetacentric) and manatees from Puerto Rico and Florida. Based on such morphological discontinuity and chromosomal divergence, we hypothesize that the Amazon River mouth may be acting as a reproductive barrier for the T. m. manatus population in Brazil, thus indicating that its taxonomic status and conservation strategies need an urgent reassessment.
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Occurrence of Cryptosporidium spp. in Antillean Manatees (Trichechus manatus) and Amazonian Manatees (Trichechus inunguis) from Brazil
Journal of Zoo and Wildlife Medicine, 2011Co-Authors: João Carlos Gomes Borges, Maria Aparecida Da Gloria Faustino, Leucio Câmara Alves, Miriam MarmontelAbstract:Abstract: Infections by Cryptosporidium spp. in aquatic mammals is a major concern due to the possibility of the waterborne transmission of oocysts. The aim of the present study was to report the occurrence of Cryptosporidium spp. in Antillean manatees (Trichechus manatus) and Amazonian manatees (Trichechus inunguis) from Brazil. Fecal samples were collected and processed using Kinyoun's method. Positive samples were also submitted to the direct immunofluorescence test. The results revealed the presence of Cryptosporidium spp. oocysts in 12.5% (17/136) of the material obtained from the Antillean manatees and in 4.3% (05/115) of the samples from the Amazonian manatees. Cryptosporidium spp. infection was more prevalent in captive animals than in free-ranging specimens.
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growth curve of free ranging Trichechus inunguis
Biota Neotropica, 2010Co-Authors: Jociery Einhardt Vergaraparente, Miriam Marmontel, Cristiano Leite Parente, Jean Carlos Ramos SilvaAbstract:The objective of this work was to describe growth curves for free-ranging Amazonian manatees in Brazil. Data analyzed included age estimates and biometrics from 60 Amazonian manatees (33 males and 27 females) captured between 1993 and 2006 by local residents of the mid-Solimoes and Pirativa Rivers, in Amazonia, and collected by the Instituto de Desenvolvimento Sustentavel Mamiraua and Centro Nacional de Conservacao e Manejo de Mamiferos Aquaticos/ICMBio. The non-linear mathematical model used to analyze the data was the von Bertalanffy's equation; two growth curves were calculated, one for males L(t)male = 299.4[1-e-0.0897507(t+6.55696)], and one for females L(t)female = 256.1[1-e-0.23731(t+ 3.01921)]. Based on these equations, length at birth for the Amazonian manatee is estimated at 133.2 cm (average = 113.0 cm; SD = 34.4 cm) for males, and 131.0 cm (average = 124.7 cm; SD = 22.0 cm) for females. Among the males, the annual growth rate was 0.09 cm (95% CI: ± 0.002), with a maximum length of 299.4 cm (95% CI: ± 2.039), while females presented a growth rate of 0.24 cm per year (95% CI: ± 0.004), reaching up to 256.1 cm (95% CI: ± 0.4832) of total length. Even though von Bertalanffy's equation is not commonly used for sirenians, and considering that when previously applied it did not obtain satisfactory results, in this study it proved adequate for the establishment of the growth curve for free-ranging Amazonian manatees.
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ocurrencia de cryptosporidium spp en manati amazonico Trichechus inunguis natterer 1883
Biotemas, 2007Co-Authors: João Carlos Gomes Borges, Fabia De Oliveira Luna, Maria Aparecida Da Gloria Faustino, Leucio Câmara Alves, Danielle Dos Santos Lima, Carla Veronica Carrasco Aguilar, Jociery Einhardt Vergaraparente, Ana Maria Alves Lima, Miriam MarmontelAbstract:Ocurrence of Cryptosporidium spp. in Amazonian manatees (Trichechus inunguis, Natterer, 1883). The apicomplexa protozoa Cryptosporidium infects several mammals, including terrestrial and aquatic species. In the epidemiology of this infection, the ingestion of water and/or food contamined with oocysts comprises the main mechanism of transmission to susceptible animals. Among the Sirenians, the occurrence of this coccidium has been reported in dugongs (Dugong dugon) and Antillean manatee (Trichechus manatus manatus). The present study was conducted with the aim of verifying the occurrence of Cryptosporidium spp. in Amazonian manatee. For this purpose, fecal samples were collected from ten free-ranging Amazonian manatees, two specimens in captivity, and 103 supernatants fecal samples. The samples were processed by the sedimentation method in formol-ether and Kinyoun stain technique for the presence of Cryptosporidium spp.. The positive samples were then submitted to Direct Immunoflorescence Test. The results showed 4.34% (05/115) of positive samples. This is the first report of Cryptosporidium spp. in the Amazonian manatee.
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age determination in manatees using growth layer group counts in bone
Marine Mammal Science, 1996Co-Authors: Miriam Marmontel, Howard I Kochman, Thomas J Nhea, Stephen R HumphreyAbstract:Growth layers were observed in histological preparations of bones of known-age, known minimum-age, and tetracycline-marked free-ranging and captive Florida manatees (Trichechus manatus latirostris), substantiating earlier preliminary findings of other studies. Detailed analysis of 17 new case histories showed that growth-layer group (GLG) counts in the periotic bone were consistent with known age, or time since tetracycline administration, but were less reliable in other bones. GLG counts were also made in periotic bones of 1,196 Florida manatees of unknown age found dead from 1974 through 1991. These counts were conducted in order to assess variability and to determine relationships among estimated age, size, sex, and degree of bone resorption. Resorption can interfere with accuracy of GLG counts. This effect does not occur until ages greater than about 15 yr and body lengths greater than 300 cm are attained. GLGs were also observed in periotic bones of Antillean manatees (Trichechus manatus manatus) but were not validated against known-age specimens. Use of GLG counts in the periotic bone is suitable for application to studies of population dynamics and other age-related aspects of manatee biology.
Maura Elisabeth Moraes De ,sousa - One of the best experts on this subject based on the ideXlab platform.
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distribution of south american manatees Trichechus manatus linnaeus 1758 and t inunguis natterer 1883 sirenia trichechidae
Boletim do Museu Paraense Emílio Goeldi - Ciências Naturais, 2020Co-Authors: Cibele R Bonvicino, Maura Elisabeth Moraes De ,sousa, Maria Carolina Viana, Edivaldo Herculano Correa De Oliveira, Renata Emin, Jose De Sousa E Silva, Salvatore SicilianoAbstract:A America do Sul e unica em registrar duas especies de peixes-bois: o peixe-boi-marinho, Trichechus manatus, e o peixe-boi-da-amazonia, T. inunguis. Essas especies podem ser distinguidas pela coloracao ventral; totalmente cinza na primeira, enquanto T. inunguis tem um padrao de manchas brancas no ventre, e a presenca de unhas nas nadadeiras peitorais, ausentes em T. inunguis. A morfologia e a distribuicao das especies de Trichechus sao claramente estabelecidas. No entanto, mostramos aqui que a mancha do ventre e a presenca de unhas na nadadeira peitoral podem ser polimorficas. Esses achados nos instigaram a verificar toda informacao disponivel a respeito dos registros de peixes-bois. Em vista da falta de dados precisos sobre a localizacao dos peixes-bois em publicacoes anteriores, produzimos um gazetteer e um mapa de Trichechus spp. na America do Sul, utilizamos registros originais coletados pelo Grupo de Estudos de Mamiferos Aquaticos da Amazonia (GEMAM) do Museu Paraense Emilio Goeldi, todos os dados revisados por pares, incluindo dissertacoes, teses e arquivos de jornais com fotos evidenciando caracteres diagnosticos. Finalmente, apresentamos um relato completo sobre a distribuicao das especies de peixes-bois na America do Sul e a necessidade de melhorar a identificacao dessas especies, para uma efetiva implementacao de estrategias de conservacao.
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Análise da ocorrência de peixes-boi com base no conhecimento ecológico local e nos parâmetros ambientais na costa leste da Ilha de Marajó, Pará
Programa de Pós-Graduação em Biologia Ambiental, 2011Co-Authors: Maura Elisabeth Moraes De ,sousaAbstract:FAPESPA - Fundação Amazônia de Amparo a Estudos e PesquisasAtualmente, existem ao redor do mundo três espécies de peixes-boi: a) Trichechus manatus (Linnaeus, 1758); b) Trichechus senegalensis (Link, 1795) e c) Trichechus inunguis (Natterer, 1883), todas pertencentes à família Trichechidae. Algumas características ambientais parecem influenciar a presença dos peixes-boi em uma determinada área, tais como: i) temperatura da água – principalmente para áreas subtropicais, ii) profundidade dos corpos d’água, iii) salinidade e iv) ação das marés; v) disponibilidade de alimento e vi) baixa hidrodinamica. Apesar de as espécies de sirênios existentes no Brasil estarem protegidas pela Lei Federal de Proteção à Fauna (Lei nº 5.197, de 03-01-1967) e sua alteração (Lei nº 7.653, de 18-12- 1987) e pela Lei de Crimes Ambientais (Lei nº 9.605/98, de 12-02-98), o peixe-boi amazônico e o peixe-boi marinho ainda correm risco de desaparecimento em um futuro próximo, sendo por isso, considerados como vulnerável e muito ameaçado de extinção, respectivamente, pela Portaria IBAMA nº 1.522/89. O presente estudo tem como objetivo investigar a ocorrência de sirênios do gênero Trichechus com base no conhecimento ecológico local e nos parâmetros ambientais existentes na costa leste da Ilha do Marajó, no Estado do Pará. Para tanto foi avaliado o nível de conhecimento dos pescadores locais sobre os peixes-boi; mapeada as áreas de ocorrência dos peixes-boi com base no conhecimento ecológico local e determinou as áreas de maior ou menor probabilidade de ocorrência de peixes-boi com base em indicadores ambientais. Os pescadores locais possuem um excelente conhecimento sobre o peixe-boi, informando características morfológicas, hábito alimentar e preferências ambientais satisfatórias. As ameaças diretas (caça) para a região não estão evidentes devido à diminuição de mão de obra especializadas, havendo apenas captura oportuna. Foi registrado durante o estudo dois encalhes na região e segundo informações de mortalidade de Trichechus spp. na área, nos últimos 50 anos morrem no mínimo 43 animais, sendo estes principalmente usados na farmacologia e consumo. O município de Salvaterra é o com maior probabilidade de ocorrência de peixe-boi segundo as características ambientais (menor intensidade de correntes, baixa salinidade, abundancia de alimento, menor tráfego de embarcações motorizadas) corroborando com os dados do conhecimento ecológico local, que indica a mesma área como de uso pelos peixes-boi. Apesar do incremento nos últimos anos nos estudos dos peixes-boi para o estado do Pará, ainda se faz necessário o investimento maior na pesquisa acerca desses animais. A continuidade das ações relacionadas ao manejo e a conservação dos peixes-boi devem ser somadas a participação dos atores sociais para uma rede de informações mais eficiente a fim de minimizar a perda de hábitat, os encalhes e aperfeiçoar as ações de resgate e reabilitações dos sirênios no estado. A foz do rio Amazonas deve ser especialmente estudada, pois se trata de uma área de simpatia das duas espécies ocorrentes no Brasil que influencia diretamente na conservação dos peixes-boi do todo o país
